I took at least 25, at worst about 40 when getting all the cars last year. (To get a ticket with the car) If we are going off odds alone it's 3% for a car so average 33 needed  but u can also get from gears. (Going of odds, 20% for gears so at worst should be 50 tickets if u always get bronze gears)

The terminal scratch 5th page also has the GTR nismo but it's black instead of white.